please help due in 5 minutes will give brainliest.
Answer:
Width = 12
Perimeter = 42
We need to use the Pythagorean theorem in order to find the width
[tex]15^{2} = 9^{2} + w^{2}[/tex]
[tex]15^{2} - 9^{2} = w^{2}[/tex]
144 = [tex]w^{2}[/tex]
w = 12